Afficher la notice abrégée

How do drought and warming influence survival and wood traits of Picea mariana saplings?

hal.structure.identifierUniversité du Québec à Chicoutimi [UQAC]
dc.contributor.authorBALDUCCI, Lorena
hal.structure.identifierUniversité du Québec à Chicoutimi [UQAC]
dc.contributor.authorDESLAURIERS, Annie
hal.structure.identifierNational Research Council of Italy | Consiglio Nazionale delle Ricerche [CNR]
dc.contributor.authorGIOVANNELLI, Alessio
hal.structure.identifierUniversité du Québec à Chicoutimi [UQAC]
dc.contributor.authorBEAULIEU, Marilène
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierUniversité du Québec à Chicoutimi [UQAC]
dc.contributor.authorROSSI, Sergio
hal.structure.identifierLaboratoire d'Etudes des Ressources Forêt-Bois [LERFoB]
dc.contributor.authorRATHGEBER, Cyrille
dc.date.issued2015
dc.identifier.issn0022-0957
dc.description.abstractEnWarming and drought will occur with increased frequency and intensity at high latitudes in the future. How heat and water stress can influence tree mortality is incompletely understood. The aim of this study was to evaluate how carbon resources, stem hydraulics, and wood anatomy and density determine the ability of black spruce saplings to survive daytime or night-time warming (+ 6 °C in comparison with control) in combination with a drought period. Plant water relations, the dynamics of non-structural carbohydrates and starch, mortality rate, and wood anatomy and density of saplings were monitored. Warming, in conjunction with 25 d of water deficit, increased sapling mortality (10% and 20% in night-time and daytime warming, respectively) compared with the control conditions (0.8%). Drought substantially decreased gas exchange, and also pre-dawn and mid-day leaf water potential to values close to –3MPa which probably induced xylem embolism (xylem air entry point, P 12, being on average around –3MPa for this species). In addition, the recovery of gas exchange never reached the initial pre-stress levels, suggesting a possible loss of xylem hydraulic conductivity associated with cavitation. Consequently, mortality may be due to xylem hydraulic failure. Warmer temperatures limited the replenishment of starch reserves after their seasonal minimum. Lighter wood was formed during the drought period, reflecting a lower carbon allocation to cell wall formation, preventing the adaptation of the hydraulic system to drought. Saplings of black spruce experienced difficulty in adapting under climate change conditions, which might compromise their survival in the future.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subject.encarbon balance
dc.subject.enclimate change
dc.subject.endrought
dc.subject.ensurvival
dc.subject.enwarming
dc.subject.enwood anatomy
dc.subject.enwood density
dc.title.enHow do drought and warming influence survival and wood traits of Picea mariana saplings?
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/eru431
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalJournal of Experimental Botany
bordeaux.page377-389
bordeaux.volume66
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-01195080
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01195080v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Experimental%20Botany&rft.date=2015&rft.volume=66&rft.issue=1&rft.spage=377-389&rft.epage=377-389&rft.eissn=0022-0957&rft.issn=0022-0957&rft.au=BALDUCCI,%20Lorena&DESLAURIERS,%20Annie&GIOVANNELLI,%20Alessio&BEAULIEU,%20Maril%C3%A8ne&DELZON,%20Sylvain&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée